Soundproofing picture recording camera



Oct. 10, 1933. L. DE FOREST SQUNDPROOFING PICTURE RECORDING CAMERA Filed Sept. 22, 1928v Lee 33; h s flwommj 5 8.6%,

Patented Oct. 10, 1933 r 1,929,626

1,929,626 SOUNDPROOFING PICTURE RECORDING CAMERA Lee de Forest, New York, N. Y., assignor to De Forest Phonofilm Corporation, New York, a corporation of Delaware Application September 22, 1928 Serial No. 307,616

9 Claims. (Cl. 88-162) This invention relates in general to cameras effective and unsatisfactory. This is true even for photographically recording pictures conif the window in the side of the booth through structed so as to prevent the recording on the which the camera receives its light is covered sound film of the undesired noises incident to the by one or more sheets of optical glass. One sheet operation of the camera itself. of optical glass is in itself quite inefiective and One of the objects of this invention is the locatwo sheets of optical glass separated by an air tion of a picture recording camera within an space for sound deadening purposes whilebeing evacuated chamber in order topreventthe audible fairly satisfactory in eliminating sounds from generation of sounds that would be picked up by the booth very materially reduce the amount of the microphones and recorded on the sound film. light reaching the camera; whereas for color A further object of this invention is the prophotography work it is very essential that the vision of apparatus of this nature which is relamaximum amount of light reach the camera. tively simple in construction and which is adapted To obviate this difficulty and permit the use to permit of the correct operation and manipulaof a microphone close to the camera which is tion of the camera without impairing its funcrecording colored pictures I have devised an arti rangement which I find is exceedingly effective These and other objects, as will appear from rendering even the very n i yp of c red the following disclosure, are secured by means of picture camera practically silent so far as any this invention. undesired sound effects it may have on the This invention resides substantially in the commicrop bination, construction, arrangement, and relative Referring to the draw n the upporting trilocation of parts, all as will appear more fully n for the camera s Shown comprising the l s hereinafter, 2 and platform 1 on which is mounted the rotat- The single figure is a side elevational view with abl pl tf 4 and th perati handl s 3 for some parts in cross section of the device of this tr in th p siti n f th a. s s w l invention, known in this art. Pivotally mounted on the It has long been known in the art of recording member 418 a ack t 5 having the plate Portion sound and motion simultaneously wher it i 6 to which the rest of the mechanism is secured. necessary to have a microphone located some- Superimposed p the Plate member 615 a Sheet where near the picture recording camera that the of resilient material 7 which may be of felt, noise from the mechanism of the camera is freoelotex, or other su ta l v at a s rbin quently recorded with the sound which it is demeterialsupported n the Sheet of resilient sired to record. Effortshave been made in the materiel-17 is a table platform member 3 P past to prevent the noise of the camera from Vided with a groove in its pp Sur in which reaching the microphone by placing the cam ra, is an inset of rubber or gasket of other suitable in a sound proof booth, as shown in my United material The members a 3 are fi y States Patent No. 1,653,155, issued December 20, s d together y m ans f nuts and bolts 9 192'7. Such means have been fairly satisfactory which are separated from the members6and 8 by y when used in connection with the ordinary momeans of suitable washers or bushings of felt and tion picture camera equipped with high speed the like. By means of this structure any vibramechanism which is quieter than the ordinary tions set up on the upper paltform are not transstep by step camera mechanism. mitted to the supporting mechanism and unde- However, in color photography, when it is desired sounds are thus prevented at this point. sired to make a sound record at the same time, Mounted on the platform 8 is the picture recordit has been found that the camera employed for ing camera 11 which, of course, may be of any taking colored motion pictures is necessarily very suitable form and construction and in itself much noisier in its operation than is the ordiforms no part of this invention. The camera nary camera for black and white film recordaperture is shown at 12 and an electric motor 13 ing. The mechanical complications which cause is provided for driving the camera. The film this noise seem to be inherent to most, if not all, magazines are shown at 14 and 15 and are driven apparatus employed in the processing of color from the camera proper by means of the belt 16. photography and I have found that to effectively It may again be pointed out that all of this struceliminate or subdue the noise from the color ture is merely given to indicate generally a picture camera by placing the same in a sound camera and the method of driving it in order to proof booth no matter how constructed is insecure the benefits of this invention.

At 17 is a container or instance, bell-shaped and chamber which is, for open at the bottom.

is taking place within the apparatus. A suitable electric light and shade 22 controllable from the outside I have found that a bell jar device of this type is very effective in silencing camera noises and the camera and removal What I seek Patent is:

1. In an apparatus of the type described, the combination with a motion picture camera, a support therefor, and a to secure by United States Letters with the light aperture of said camera, and means for exhausting the interior of said container.

described, the

era, and means container.

cle, and means for operating said photographic recording device from a point external to the receptacle.

7. In an apparatus of the type described, the combination comprising a support, a photographic recording camera mounted on said support,

and a container having a transparent window dow portion therein in alignment with the light aperture of said camera, adapted to be inverted over said camera and rest on said gasket in airtight fashion, and means for exhausting the interior of the container.

9. In an apparatus of the type described, the combination comprising a sound insulated support, a motion picture camera on said support, means tor operating said camera connected thereto, an air and light-tight cover over said camera having a transparent window portion therein in alignment with the light aperture of said camera, and means connected with the space formed by the cover and support for exhausting the air therefrom.

LE on FOREST. 

